//这里填你的代码^^
//注意代码要放在两组三个点之间,才可以正确显示代码高亮哦~
class MyQueue {
public:
/** Initialize your data structure here. */
stack<int> stk,cache;
MyQueue() {
}
/** Push element x to the back of queue. */
void push(int x) {
stk.push(x);
}
void copy(stack<int> &a,stack<int> &b)
{
while(a.size())
{
b.push(a.top());
a.pop();
}
}
/** Removes the element from in front of queue and returns that element. */
int pop() {
copy(stk,cache);
int ans = cache.top();
cache.pop();
copy(cache,stk);
return ans;
}
/** Get the front element. */
int peek() {
copy(stk,cache);
int ans2 = cache.top();
copy(cache,stk);
return ans2;
}
/** Returns whether the queue is empty. */
bool empty() {
return stk.empty();
}
};
/**
* Your MyQueue object will be instantiated and called as such:
* MyQueue obj = MyQueue();
* obj.push(x);
* int param_2 = obj.pop();
* int param_3 = obj.peek();
* bool param_4 = obj.empty();
*/